Read and download free pdf of CBSE Class 10 Physics Light Assignment Set D. Get printable school Assignments for Class 10 Physics. Standard 10 students should practise questions and answers given here for Physics in Grade 10 which will help them to strengthen their understanding of all important topics. Students should also download free pdf of Printable Worksheets for Class 10 Physics prepared as per the latest books and syllabus issued by NCERT, CBSE, KVS and do problems daily to score better marks in tests and examinations
Light Class 10 Physics Assignment Pdf
Class 10 Physics students should refer to the following printable assignment in Pdf for Light in standard 10. This test paper with questions and answers for Grade 10 Physics will be very useful for exams and help you to score good marks
Class 10 Physics Assignment for Light
• Light: The natural agent that stimulates sight and makes things visible. Light is reflected from all surfaces.
• Regular reflection takes place when light is incident on smooth, polished and regular surfaces.
• Diffused/irregular reflection takes place from rough surfaces.
• Reflection of Light: Bouncing back of light after striking the surface, in the same medium, is called reflection.
• Types of Reflection:
(i) Regular Reflection: When a narrow beam of light strikes a mirror, the light will not reach your eye unless your eye is positioned at just the right place where the law of reflection is satisfied.
(ii) Diffused or Irregular Reflection: When light is incident upon a rough surface, it is reflected in many directions.
• Two laws of reflection are
• The angle of incidence is equal to the angle of reflection.
• Incident ray, reflected ray and the normal drawn at the point of incidence to the reflecting surface, lie in the same plane.
• Image formed in a plane mirror undergoes lateral inversion.
• Two mirrors inclined to each other give multiple images.
• Beautiful patterns are formed in a kaleidoscope because of multiple reflections.
• Sunlight, called white light, consists of seven colours.
• Splitting of light into its constituent colours is known as dispersion.
• Important parts of the eye are cornea, iris, pupil, lens, retina and optic nerve.
• A normal eye can see nearby and distant objects clearly.
• Visually challenged persons can read and write using Braille system.
• Visually challenged persons develop their other senses more sharply to improve their interaction with their environment.
• Parts of Human Eye:
(i) Cornea: Transparent bulge on the front surface of the eyeball which protects the eye and helps in refraction of light.
(ii) Iris: Coloured diaphragm behind the cornea which controls the amount of light entering the eye.
(iii) Pupil: Dark hole in the middle of iris through which light enters the eye.
(iv) Eye lens: Transparent, crystalline structure behind pupil and iris.
(v) Ciliary muscles: Hole the eye lens in position and control the focal length of the eye lens.
(vi) Retina: Surface of the rear part of the eyeball where the light entering the eye is focused.
(vii) Rods and Cones: Rod cells respond to the brightness of light while cone cells respond to colours.
(viii) Blind spot: It is the least sensitive point where no rodsd and cones are present.
(ix) The space between the cornea and the eye lens is filled with aqueous humour.
(x) The space between the eye lens and the retina is filled with vitreous humour.
Short Answer Questions
Question. With the help of a ray diagram show the position, size and the nature of the image formed by a convex lens for various positions of the object.
Question. Draw and explain the ray diagram formed by a convex mirror when
(a) object is at infinity. (b) object is at finite distance from the mirror.
Answer : (a) When the object is at infinity, the image is formed at focus. ‘F’.
(b) When the object is at finite distance the image is formed behind the mirror, it is virtual image and diminished in size.
Question. Redraw the given diagram and show the path of retracted ray.
Question. Amit visited a fair and saw a mirror in which he got a very funny image. The above part of his body was big in size, middle part was of normal size and the lower part of the body showed very small size. What kind of mirror is this?
Answer : Upper part – Concave mirror; Middle part : Plane mirror; Lower part : Convex mirror.
Question. Define the following.
(a) What is ray?
(b) What is beam?
(c) What is reflection of light?
(d) What is reflector?
(e) What is focal length?
(f) What is principal focus?
(g) What is refraction?
(h) What is optically rare medium?
(i) What is optically denser medium?
(j) What is power?
(k) What is 1 dioptre?
Answer : (a) It is the path of light.
(b) Group of parallel light rays emitted by the source of light.
(c) Bouncing back of light after striking any surface.
(d) The surface which reflects the light.
(e) The distance between the pole and the principal focus of the spherical mirror.
(f) A point of the principal axis where the rays of light parallel to principal axis meet.
(g) Bending of light ray when it travels from one medium to another.
(h) When the speed of light is more as compared to other medium.
(i) When the speed of light is less as compared to another medium.
(j) The degree of convergence or divergence of light rays achieved by a lens is expressed in terms of its power
(k) It is the power of lens whose focal length is 1 m.
Question. Write the laws of reflection.
Answer : (a) The angle of incidence is equal to angle of reflection.
(b) The incident ray, the normal to the mirror at the point of incidence and the reflected ray, all lie in the same plane.
Question. Give uses of plane mirror.
Answer : • Looking glass
• Used in submarines
• Solar cooker
Question. Give uses of concave mirror.
Answer : • Used as reflectors in car headlights, searchlights, etc.
• Used as shaving mirror.
• Used in solar cooker to focus the sunlight on one point.
Question. What are the two types of refractive index?
Answer : • Relative refractive index– It is the ratio of speed of light in one medium to the speed of light in another medium
• Absolute refractive index– It is the ratio of light in vacuum to the speed of light in another medium
Question. Name the type of mirror used in the following situations.
(a) Headlights of a car.
(b) Side/rear-view mirror of a vehicle.
(c) Solar furnace.
Answer : (a) Concave mirror
(b) Convex mirror
(c) Concave mirror
Question. Find the focal length of a lens of power –2.0 D. What type of lens is this?
Answer : Given, Power = –2.0
The given lens is concave (power of concave lens is –ve)
P = 1 /f (in metre)
–2.0 = 1/f
f = 1/–2 m
f = – 50 cm
∴ The focal length is – 50 cm.
Q1 A ray of light AM is incident on a spherical mirror as shown in the diagram.Redraw the diagram and show the path of reflected ray.
Q2 Explain why a ray of light passing through the centre of curvature of a concave mirror gets reflected along the same path?
Q3 What is the radius of plane mirror?
Q4 Why do we use convex surface for side view mirror?
Q5 Relate the focal length ‘f ‘ and the radius of curvature ‘R’.
Q6 Which kind of mirror is used in the headlights of a motor car and why?
Q7 What is focal length of a plane mirror?
Q8 A concave mirror is placed in water. Will there be any change in the focal length?Give reasons.
Q9 Name the type of mirror which always forms a virtual and diminished image.
Q10 A ray of light LM is incident on a mirror as shown in the figure. The angle of incidence for the ray is the angle between it and the line joining the other points in the figure. Name these two points.
Q15 Name the type of mirror used in:
(a) Solar furnaces
(b) Rear view mirror of a vehicle
(c) Headlights of a car. Support your answer with reason.
Q16 Draw the ray diagram to show
(i) the position
(ii) nature of the image formed when an object is placed between focus F and pole P of a concave mirror.
Q17 A concave mirror and a convex lens are held separately in water. What changes (if any) do you expect in the focal length of either?
Q18 A convex mirror used on an automobile has a focal length of 3m. If a vehicle behind is at a distance of 5m, find the location of the image.
Q19 (i) Distinguish between a real and virtual image.
(ii)Distinguish between a convex and concave mirror.
Q20 We have to form an erect image of an object placed in front of a concave mirror of focal length 15cm. Draw the ray diagram.
Q21 Why does a ray falling normally on a plane mirror, retrace its path?
Please click the below link to access CBSE Class 10 Physics Light Reflection and Refraction Assignment Set D
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